I do not keep it heavy brackish salinity is about 10 and 1.004 to 1.oo8 all the fish seem to be doing well.and are growing very fast.I know it crowded but I have a drip system that changes 200 gallons a day which at night I add more salt and sachem safe.I also have crushed coral that keeps PH at 8.00 the tank is 400 gallons I like a lot of fish in the tank keeps nipping down and I like the action.